Throttle orifice plate assembly resistant to flow accelerated corrosion

Abstract

The invention belongs to the technical field of design and operation of nuclear power plants and particularly relates to a throttle orifice plate assembly resistant to flow accelerated corrosion. According to the throttle orifice plate assembly resistant to flow accelerated corrosion, through the optimization design of the structure and material of the orifice plate assembly, the problem of flow accelerated corrosion thinning of a throttle orifice plate and a downstream pipeline thereof is avoided, and the orifice plate assembly is convenient to machine and mount, so that safe and reliable operation of pressure bearing pipelines of the nuclear power plants is guaranteed. The throttle orifice plate assembly resistant to flow accelerated corrosion is characterized by comprising a throttle orifice plate assembly body and a flow accelerated corrosion resistance zone; the left end of the throttle orifice plate assembly body is fixedly connected with an upstream pipeline, and the right end of the throttle orifice plate assembly body is fixedly connected with a downstream pipeline; the flow accelerated corrosion resistance zone is arranged inside the throttle orifice plate assembly body and located on the left side of the downstream pipeline. The orifice plate assembly developed by the invention is accurate in analysis, reasonable in design, safe and reliable, flow accelerated corrosion thinning can be effectively avoided, and maintenance-free is achieved during the life.

Description

technical field [0001] The invention belongs to the technical field of design and operation of nuclear power plants, and in particular relates to a throttling orifice assembly resistant to accelerated flow corrosion. Background technique [0002] Flow-accelerated corrosion is the main failure mechanism of high-temperature and high-pressure pipelines in the secondary circuit of nuclear power plants. There have been more than 300 pipeline breaches caused by corrosion degradation in the secondary circuit of nuclear power plants worldwide, which seriously affected the safety, stability and economic operation of nuclear power plants, and even caused The tragedy of many deaths and serious injuries; [0003] The main influencing factors of flow-accelerated corrosion are materials, temperature, water chemistry, fluid mechanics, etc. When the temperature, water chemistry, and fluid mechanics characteristics are determined, the flow-accelerated corrosion of carbon steel or low-alloy s...

AI Technical Summary

Problems solved by technology

[0006] 1. After the orifice plate and downstream pipelines are replaced according to the original design, the problem of accelerated flow corrosion will still occur in the subsequent operation, which requires regular follow-up and supervision, and there is a risk of pipeline leakage and leakage, which increases management costs and operational risks

[0007] 2. Simply replace the pipe section downstream of the orifice plate with a flow-accelerated corrosion-resistant material pipe section, and add a pipe butt weld or two socket welds. The increase in the number of welded joints reduces the reliability of the pipeline and increases the management accordingly. cost and operational risk

[0008] 3. The scope of influence of flow-accelerated corrosion downstream of the orifice plate is not clear. After blindly replacing the pipeline downstream of the orifice plate, the affected area of ​​flow-accelerated corrosion may not be completely covered. After the pipe section is replaced, there is still a risk of flow-accelerated corrosion

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