Power station condenser cooling pipe steam flow excitation assessment method based on shell side flow field

A vapor flow excitation and condenser technology, which is used in data processing applications, complex mathematical operations, design optimization/simulation, etc., can solve the problem of uneven distribution of the flow field on the side of the condenser shell, failure and leakage of cooling pipes without considering and other problems to achieve the effect of avoiding steam flow excitation, improving accuracy and high engineering significance

Pending Publication Date: 2022-07-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] Even so, there will still be accidents of cooling tube failure and leakage caused by steam flow excitation in the condenser in production and operation. The reason is that the steam flow The parameters are the average parameters of steam, without considering the inhomogeneity of the flow field distribution on the shell side of the condenser, so only the average steam parameters are used to evaluate the steam flow excitation of the condenser cooling tube as a whole, and the condensation cannot be avoided. The cooling pipe steam flow excitation phenomenon occurs in some parts of the device

Method used

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  • Power station condenser cooling pipe steam flow excitation assessment method based on shell side flow field
  • Power station condenser cooling pipe steam flow excitation assessment method based on shell side flow field
  • Power station condenser cooling pipe steam flow excitation assessment method based on shell side flow field

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Embodiment 1

[0064] like figure 1 As shown, this embodiment provides a method for evaluating the vapor flow excitation of a cooling tube of a large condenser based on the shell-side flow field, which includes the following steps:

[0065] S1. Taking the solid model of the condenser throat of the coupled exhaust cylinder as the object, establish the motion equation of the steam at the condenser throat according to the laws of mass conservation and momentum conservation, and use flow heat transfer numerical calculation software (such as Fluent, CFX, etc.) to solve The specific distribution of the steam flow inside the throat of the condenser is obtained, which is as follows:

[0066] S101. Based on the actual shape and size, use geometric modeling software to construct a geometric model of the condenser throat coupled with the low-pressure exhaust cylinder; , the bypass diffusion device, and the communication port of the high-pressure hydrophobic expansion container have a great influence o...

Embodiment 2

[0136] According to engineering experience, the risk factor is taken as a safety margin. If the risk factor β>1-Δ, there is a risk of steam flow excitation in the cooling pipe; among them, Δ is a set normal number, and the range is (0, 1). This embodiment where Δ is set to 0.1.

[0137] The rest of the settings are the same as in Example 1.

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Abstract

The invention relates to a power station condenser cooling pipe steam flow excitation assessment method based on a shell side flow field, and the method comprises the steps: S1, constructing a condenser throat geometric model of a coupling low-pressure exhaust hood, and solving to obtain the steam flow distribution of the condenser throat; s2, extracting and processing flow field parameters on the outlet section of the condenser throat part in different regions; s3, the steam flow distribution of the steam on the shell side of the condenser on the vertical section is solved by taking the flow field of the throat outlet of the condenser as an inlet boundary condition for the steam to flow into the shell side of the condenser; s4, on the basis of steam flow distribution on the vertical section of the condenser shell side, steam critical transverse flow velocity distribution of all areas on the section is obtained through calculation; and S5, based on the steam critical cross flow velocity distribution of each area on the vertical section of the condenser shell side, steam flow excitation evaluation is carried out on the condenser cooling pipe. Compared with the prior art, the method has the advantages that the steam flow excitation of the cooling pipe can be evaluated in detail in the pipe bundle area, and the accuracy is higher.

Description

technical field [0001] The invention relates to the technical field of condensers, in particular to a method for evaluating steam flow excitation of a cooling pipe of a condenser in a power station based on a shell-side flow field. Background technique [0002] The power station condenser is a shell-and-tube heat exchanger with a huge size and complex structure. Cooling tube vibration is one of the equipment failures that must be avoided in the condenser. Because the vibration of the cooling tube is mild, it will cause the cooling tube to be rubbed, which is a potential safety hazard. The power station unit is shut down. [0003] Steam flow excitation is one of the forms of high-speed steam-induced condenser cooling tube vibration recognized by the industry. The spacing (that is, the maximum span of the cooling pipe) specifies the specific design requirements; the national standard "Heat Exchanger" (GB / T 151-2014) provides the calculation formula for the critical cross-flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/11G06F30/23G06Q10/06
CPCG06F30/20G06F17/11G06F30/23G06Q10/0635Y02E60/00
Inventor 张莉汪昆张冬鲍旭东危安泽孙庆男
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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