Power plant seawater pipeline reliability enhancing structure

Abstract

The utility model relates to a power plant seawater pipeline reliability enhancing structure, one end of a pipeline is connected with an outlet of a circulating water pump, the other end of the pipeline is connected to a condenser, an interception grating, a secondary filter screen isolation butterfly valve and a secondary filter screen are sequentially arranged in the pipeline, and the interception grating is arranged at the bottom of the pipeline at the upstream of the secondary filter screen isolation butterfly valve; sacrificial anode blocks are arranged at the bottom of the pipeline. The sacrificial anode block has the beneficial effects that the structure of the sacrificial anode block is optimized according to the actual situation on site, so that the height size of the sacrificial anode block is reduced, and meanwhile, the sacrificial anode block is prevented from falling off or other foreign matters are prevented from entering cooling system equipment to cause jamming to further improve the reliability of the equipment. The intercepting grating is specially designed and manufactured to be installed on the front pipe section of the secondary filter screen isolation butterfly valve, the intercepting effect can be achieved on the premise that the flow of cooling water is not affected, and the secondary filter screen isolation butterfly valve, a secondary filter screen and a condenser which are arranged later are protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power plant seawater cooling, especially including a power plant seawater pipeline reliability enhancement structure. BACKGROUND

[0002] The inner wall and the outer wall of the power plant seawater cooling water pipeline are protected by sacrificial anodes. The entire protection range includes the protection of steel pipe fittings such as the circulating water pipeline in the plant area, the pipeline in the circulating water pump house, and manholes. The design service life of the inner wall of the cooling water pipe is ≥20 years, and the design service life of the outer wall is ≥30 years. However, the actual situation is as follows: 1) The inner wall pipeline is severely corroded, and local pipe sections have appeared multiple perforation leaks due to corrosion; 2) Before the sacrificial anode block reaches the designed life, it is dissolved too quickly or unevenly, causing one of the upper and lower surfaces of the sacrificial anode block flat iron installed on the inner wall of the pipeline to fall off before it has been dissolved, and the seawater outlet of the circulating water pump hits the circulating water system equipment such as valves and secondary filter screens, causing damage to the sealing surface of the subsequent isolation valve and the jamming of the rotating bucket of the secondary filter screen.

[0003] To address the above risks, it is urgent to optimize the targeted enhancement design of the seawater cooling pipeline to achieve the purpose of high efficiency, long service life, and improved equipment reliability. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the deficiencies in the prior art and provides a power plant seawater pipeline reliability enhancement structure.

[0005] The power plant seawater pipeline reliability enhancement structure has one end of the pipeline connected to the outlet of the circulating water pump and the other end connected to the condenser. The pipeline has an intercepting grid, a secondary filter screen isolation butterfly valve, and a secondary filter screen arranged in sequence inside the pipeline. The intercepting grid is arranged at the bottom of the pipeline upstream of the secondary filter screen isolation butterfly valve. Sacrificial anode blocks are arranged at the bottom of the pipeline.

[0006] Preferably, the top of the intercepting grid is higher than the installation height of the sacrificial anode blocks inside the pipeline.

[0007] Preferably, one side of the sacrificial anode block connected to the pipeline is a corrosion-resistant surface.

[0008] Preferably, the sacrificial anode blocks are symmetrically arranged on the inner walls of the two sides of the bottom of the pipeline.

[0009] Preferably, the top of the intercepting grid is one-third of the diameter of the pipeline; the sacrificial anode blocks are symmetrically arranged on the inner walls of the two sides of the bottom of the pipeline, and the included angle between the sacrificial anode blocks is 90°.

[0010] Preferably, the pipeline at the position of the secondary filter screen is a secondary filter screen section, and the inner diameter of the secondary filter screen section is greater than the inner diameters of the pipelines on both sides.

[0011] The utility model has the following beneficial effects:

[0012] The utility model discloses according to the actual situation of the scene to the sacrificial anode block structure optimization, make the sacrificial anode block height size low, and further improve the equipment reliability, prevent the falling sacrificial anode block or other foreign matter from entering the cooling system equipment and cause the jam, specially design and make the intercepting grid installation in the secondary filter screen isolation butterfly valve front pipe section, under the premise of not influencing the cooling water flow, can also play the intercepting effect, protect the secondary filter screen isolation butterfly valve and secondary filter screen, condenser setting behind. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is power plant seawater pipeline reliability enhancement structure schematic diagram;

[0014] Figure 2 It is Figure 1 A-A section view in middle;

[0015] Figure 3 It is Figure 1 B-B section view in middle.

[0016] Explanations of the attached drawings: intercepting grid 1, secondary filter screen isolation butterfly valve 2, secondary filter screen 3, sacrificial anode block 4, secondary filter screen section 5, pipeline 6. DETAILED DESCRIPTION

[0017] The utility model will be further described below in conjunction with the embodiment. The following embodiment is only used to help understanding the utility model. It should be pointed out that for the ordinary person of ordinary skill in the art, on the premise of not departing from the principle of the utility model, still can carry out a number of modifications to the utility model, these improvements and modifications also fall within the protection scope of the utility model claims.

[0018] As an embodiment, the power plant seawater cooling water system is connected by pipeline 6 from circulating water pump to secondary filter screen isolation butterfly valve 2, secondary filter screen 3 and final cooling equipment condenser, and the power plant seawater pipeline reliability enhancement structure is as shown in Figures 1 to 3 .

[0019] In the embodiment, as shown in Figure 1 , the left end of pipeline 6 is connected to the outlet of circulating water pump, and the right end is connected to condenser, and intercepting grid 1, secondary filter screen isolation butterfly valve 2 and secondary filter screen 3 are sequentially arranged in pipeline 6, intercepting grid 1 is arranged at the bottom of pipeline 6 2.5m upstream of secondary filter screen isolation butterfly valve 2, to enhance the reliability of seawater cooling water pipeline system, and sacrificial anode block 4 is arranged at the bottom of pipeline 6.

[0020] In this embodiment, the inner diameter of the pipeline 6 is 2200 mm except for the pipeline 6 in which the secondary filter screen 3 is located, which is the secondary filter screen section 5, and the inner diameter of the secondary filter screen section 5 is 3040 mm. From the outlet of the circulating water pump to the secondary filter screen section 5, 612 sacrificial anode blocks 4 are installed, one group of two blocks every 7 meters, and 16 sacrificial anode blocks 4 are installed at the pipeline 6 of other sections.

[0021] The two sacrificial anode blocks 4 in each section are evenly arranged, as shown in Figure 3 The sacrificial anode blocks 4 are symmetrically arranged on the inner walls on both sides of the bottom of the pipeline 6, and the included angle between the sacrificial anode blocks 4 is 90°.

[0022] The top of the interception grid 1 is higher than the installation height of the sacrificial anode blocks 4 in the pipeline 6, and in this embodiment, as shown in Figure 2 The height of the interception grid 1 is 750 mm, which is about one third of the diameter of the pipeline 6.

[0023] In this embodiment, the side of the sacrificial anode block 4 connected to the pipeline 6 is the anticorrosion side. The sacrificial anode block 4 is optimized in structure and the proportion of elements in the sacrificial anode block 4 is adjusted, so that the bottom of the sacrificial anode block 4 does not dissolve, the corrosion rate of the pipeline 6 is slowed down, the uneven corrosion rate between the sacrificial anode block 4 and the flat iron in the pipeline 6 is slowed down, the pipeline 6 is protected, and the service life is long and not easy to corrode. The sacrificial anode block 4 is not easy to fall off in the late stage of dissolution, and even if it falls off, it is intercepted by the interception grid 1 in front of the secondary filter screen isolation butterfly valve 2. The performance requirements of the interception grid 3 are to intercept the sacrificial anode block 4 and foreign matter to protect the secondary filter screen isolation butterfly valve 2, the secondary filter screen 3, and the condenser, and to pass some soft garbage in the seawater system to prevent it from winding on the grid, and to reduce the impact on the flow of the cooling water system as much as possible. The height and aperture of the interception grid 3 are studied and verified, the width and thickness of the grid bars of the interception grid 3 are designed, so that the strength can meet the basic requirements of the large flow of the cooling water.

Claims

1. A power plant seawater piping reliability enhancement structure, characterized by, One end of the pipeline is connected to the outlet of the circulating water pump, and the other end is connected to the condenser. An interception grid, a secondary filter isolation butterfly valve and a secondary filter are arranged in sequence in the pipeline. The interception grid is located at the bottom of the pipeline upstream of the secondary filter isolation butterfly valve; a sacrificial anode block is provided at the bottom of the pipeline.

2. The power plant seawater piping reliability enhancement structure according to claim 1, characterized by, The top of the interception grid is higher than the setting height of the sacrificial anode block in the pipeline.

3. The power plant seawater piping reliability enhancement structure according to claim 1, characterized by, The side where the sacrificial anode block is connected to the pipeline is the anti-corrosion surface.

4. The power plant seawater piping reliability enhancement structure according to claim 1, characterized by, The sacrificial anode blocks are symmetrically arranged on the inner walls on both sides of the bottom of the pipeline.

5. The power plant seawater piping reliability enhancement structure according to claim 1, characterized by, The top height of the intercepting grid is one-third of the pipe diameter; the sacrificial anode blocks are symmetrically arranged on the inner walls on both sides of the pipe bottom, and the angle between the sacrificial anode blocks is 90°.

6. The power plant seawater piping reliability enhancement structure according to claim 1, characterized by, The pipe where the secondary filter is located is the secondary filter section, and the inner diameter of the secondary filter section is larger than the inner diameter of the pipes on both sides.

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