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Strength Assessment of the Water Vapor Cyclone

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Static Strength Assessment of the Water Vapor Cyclone

Figure 1. 3D CAD model of the water vapor cyclone: a) shade; b) transparent view

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Introduction

Subject of the investigation was determination of a static strength and utilization factors of the water vapor cyclone (WVC), which is shown on the Figure 1.

To check strength and deformation of issued design finite element model (FEM) was done (Figure 2).

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Figure 2. Finite element model of the water vapor cyclone

a)

b)

Loads and Constraints

WVC normally operates under the following conditions:

  • internal pressure: 0.38 MPa;
  • vapor temperature: 150 deg. C.

Mentioned initial conditions were applied to FEM as shown in Figure 3.

Operational conditions, including pressure pulsating loads, have been determined from CFD calculation report. Pressure distribution and pulsating in low frequency domain are shown in Figures 4 and 5.

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Figure 3. Initial load conditions: a) internal pressure; b) nodal temperatute

a)

b)

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Figure 4. Presure distribution at long section cut of WVC

Figure 5. Presure pulsating in low frequency domain

Occured Results

After checking of FEM analysis results and verified with analytical solutions the following conclusions have been made:

  1. Utilization factor (0.8 < 1.0) is Okay for the current WVC design.
  2. Obtained max stress level is not exceed allowable value (185 MPa).
  3. Axial translation of the WVC is about 5.0 mm and that is Okay for thermal load compensators which will be simoultaniously installed with pipelines.

Von Mises Stress distribution level and axial translation in WVC can be seen in Figures 6 and 7.

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Figure 6. Von Mises Stress distribution [Pa]

Figure 7. Axial (Ox) translation distribution [m]