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Coke tower inner wall stress calculation method

A coke drum and stress technology, which is applied in the field of calculation of the inner wall stress of a coke drum, can solve problems such as difficulty in stress calculation, and achieve the effect of reducing monitoring costs.

Active Publication Date: 2017-08-18
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to evaluate and predict the fatigue damage of the coke drum, it is usually necessary to accurately grasp the wall stress of the coke drum, but due to the irregularity of the local geometric shape of the coke drum and the complexity of the working conditions, it is difficult Simulation for accurate stress calculations

Method used

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  • Coke tower inner wall stress calculation method
  • Coke tower inner wall stress calculation method
  • Coke tower inner wall stress calculation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] combine figure 1 , the calculation method of the inner wall stress of the coke tower in this embodiment includes the following steps:

[0027] S101: Obtain the hoop strain of the measuring points on the outer wall of the coke tower and axial strain

[0028] In this step, a high-temperature-resistant strain gauge is installed at the measurement points on the outer wall of the coke drum, and each measurement point is equipped with a high-temperature-resistant strain gauge in the axial and circumferential directions, and each high-temperature-resistant strain gauge is connected to a measurement channel of the strain gauge. The strain gauge collects the hoop strain of the coke tower measuring point through the high temperature resistant strain gauge and axial strain data.

[0029] S102: According to the hoop strain and the axial strain Data, calculate and obtain the outer wall hoop stress of the outer wall measuring point of the coke tower

[0030] This step...

Embodiment 2

[0043] see figure 2 , this embodiment is based on Embodiment 1, the difference is that step S105 is also included.

[0044] S105, according to the axial stress of the inner wall Including the thermal stress on the inner wall and the stress superposition caused by the axial bottleneck effect, the axial stress on the inner wall of the coke drum is calculated

[0045] In this step, the axial stress on the inner wall is expressed as roll out

[0046]

[0047] in, is the axial stress on the outer wall, Stress due to axial bottleneck effect.

Embodiment 3

[0049] The method for calculating the stress of the inner wall of the coke tower provided in this example is based on the method in Example 2. The initial whole is in a uniform temperature field (120°C), and then the inner wall is directly cooled to room temperature (30°C), and its transient temperature field and thermoelastic field. The parameters of the material 15CrMo of the coke tower are shown in Table 1.

[0050] Table 1 Geometric parameters and material parameters

[0051]

[0052] The method for calculating the inner wall stress of the coke drum provided in this example has a very high precision in estimating the inner wall stress of the coke drum, and the relative error is less than 3.7%, which is now verified by finite element simulation. The numerical simulation of the thermoelastic field of a thin-walled cylinder with open ends is carried out by using the finite element method. The whole cylinder is initially in a uniform temperature field (120°C), and then th...

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Abstract

The invention discloses a coke tower inner wall stress calculation method. The method comprises steps: hoop strain epsilon(theta)o and axial strain epsilon(z)o data of an outer wall measurement point on the coke tower are acquired; according to the hoop strain epsilon(theta)o and axial strain epsilon(z)o data, the outer wall hoop stress sigma(theta)o of the outer wall measurement point on the coke tower is calculated and acquired; the outer wall hoop stress sigma(theta)o is equal to outer wall thermal stress sigmaTo, the change rate capped tau of a temperature difference between the inner wall and the outer wall along with time is calculated and acquired through a thermal stress formula; according to the change rate capped tau of the temperature difference between the inner wall and the outer wall along with the time and the inner wall hoop stress sigma(theta)i equal to the inner wall thermal stress sigmaTi, the inner wall hoop stress sigma(theta)i is calculated and acquired through the thermal stress formula. The coke tower inner wall stress calculation method is high in precision and low in cost.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for calculating the inner wall stress of a coke tower. Background technique [0002] The coke tower is the key equipment in the delayed coking process, and it is also a tower pressure vessel in the oil refining industry. During service, it undergoes cyclic heating and cooling, so that the medium carried by the container changes from gaseous to liquid to solid. In this process, the tower wall of the coke tower will experience problems such as swelling and cracking after several cycles. In order to evaluate and predict the fatigue damage of the coke drum, it is usually necessary to accurately grasp the wall stress of the coke drum, but due to the irregularity of the local geometric shape of the coke drum and the complexity of the working conditions, it is difficult Simulation for accurate stress calculations. [0003] According to the data of three large-scale surve...

Claims

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Application Information

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IPC IPC(8): G01L5/00
CPCG01L5/00
Inventor 叶伟文刘人怀汪文锋董雪林李茂东王璠杜南胜宁志华杨波梁自生
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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