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Wall deposition and wall abrasion loss prediction method based on numerical simulation

A numerical simulation and wall technology, applied in the field of forecasting, can solve problems such as time-consuming, inability to provide data, support and operation guidance, and achieve the effects of less storage space, overcoming long simulation time, and reliable data support.

Active Publication Date: 2021-11-30
NANJING YANGTZE RIVER URBAN AGCHITECTURAL DESIGN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the simulation technology in the prior art has the disadvantage of taking a long time, and cannot provide data support and operation guidance quickly and efficiently in the early stage of system design

Method used

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  • Wall deposition and wall abrasion loss prediction method based on numerical simulation
  • Wall deposition and wall abrasion loss prediction method based on numerical simulation
  • Wall deposition and wall abrasion loss prediction method based on numerical simulation

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Embodiment 1

[0085] to combine figure 1 , this embodiment discloses a method for predicting wall deposition based on numerical simulation, using the Euler method, specifically including:

[0086] (1) Build a grid model

[0087] Based on the specific shape and size of the heat exchange equipment, a mesoscopic three-dimensional geometric model of the sewage heat exchange equipment is established. According to the actual situation in the calculation domain, ICEM CFD software is used to divide the unstructured tetrahedral mesh, so as to realize the discrete calculation domain.

[0088] In order to accurately simulate the flow field of sewage in the heat exchange equipment, grid independence verification is required. The specific verification method is as follows: the global element seed size of the calculation domain is given more than two setting forms, and the sewage The grids at the entrance and exit and the wall need to be locally refined, define the maximum size of more than three grids...

Embodiment 2

[0135] This embodiment discloses a method for simultaneously predicting wall deposition and wall wear based on numerical simulation. The prediction method for fouling thermal resistance is the same as in Example 1, and the prediction method for wall wear is also based on the previously established grid model. Therefore, the network The process of building the lattice model will not be repeated here.

[0136] see figure 2 ,exist figure 1 Based on the examples, we established a wear model and imported it into Fluent, and selected the Lagrange model (also called DPM discrete model, Dense Discrete phaseModel, DPM for short) on the basis of the previous Euler model, and set Under the simulation conditions, load the wear model to calculate the mass wear amount of the wall surface per unit heat transfer area per unit time, and output and process the data to obtain the wear amount under the simulation time; finally, the time amplification factor is obtained by combining the thickne...

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Abstract

The invention discloses a wall deposition and wall abrasion loss prediction method based on numerical simulation. The method comprises the following steps of: establishing a grid model, establishing a deposition model, establishing an abrasion model, establishing a fouling thermal resistance model, setting a time amplification factor and the like, namely establishing a granular fouling deposition model from four deposition mechanisms and directly deriving a granular fouling total deposition rate; furthermore, quickly predictingwall surface deposition condition on a heat exchange surface at any time in the future. In the prediction of the wall surface abrasion loss, behaviors of particles are predicted by simulating motion trails of the particles, the abrasion and corrosion conditions of the particles in sewage to a heat exchange wall surface can be accurately simulated, the method has the advantage of high simulation precision, and the actual abrasion result is rapidly and accurately predicted by introducing a time amplification factor; according to the method, the wall surface dirt deposition condition and the wall surface abrasion loss can be predicted, so that the maintenance of heat exchange equipment is timely and effectively guided, and reliable data support and guidance are provided for the design of heat exchange systems.

Description

technical field [0001] The invention relates to a prediction method, in particular to a method for predicting wall deposition and wall wear based on numerical simulation using Euler method and Lagrangian method. Background technique [0002] At present, the rapid development of sewage source heat pump is a major measure to achieve efficient and full utilization of energy. In actual use, the heat exchange capacity of the heat exchanger mainly depends on the total heat transfer coefficient of the heat exchanger. Due to the water quality of the sewage, during the heat exchange process of pipeline transportation, the dirt in the sewage will deposit and affect the heat exchange equipment. Erosion and wear will not only lead to a decrease in the heat transfer performance of the heat transfer equipment, but also bring safety hazards. Erosion wear refers to a kind of wear phenomenon caused by the interaction between the heat exchange wall surface and the fluid containing solid part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F119/14
CPCG06F30/28G06F2111/10G06F2119/14
Inventor 任体秀马良栋江丽徐阳
Owner NANJING YANGTZE RIVER URBAN AGCHITECTURAL DESIGN
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