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苯酚汽提塔英文文献和中文翻译

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Case Studies of a Design Modification to Improve Phenol Stripper Column Safety一种提高苯酚汽提塔安全改造设计的研究英文文献和中文翻译
Case Studies of a Design Modification to Improve Phenol Stripper Column Safety
Depressive failure at the connecting locations between the phenol reactor shell and the stripper tray is one
of the primary failure modes in a phenol stripper reactor. The occurrence of cracking failure of an AISI
304 tray in the phenol stripper reactor resulted in an emergency shutdown of the petrochemical plant. Possible
causes for the stripper tray cracking were analyzed using a FEM analysis with an ANSYS program and
solutions to prevent further cracking failures of the stripper trays are suggested. Variables such as operation
pressure and stripper tray thickness were evaluated in terms of safe operation of the phenol production reactor.
The simulation results from the ANSYS analysis showed that the stress concentration at the fractured area
of the stripper tray could be reduced by a factor of 2 by doubling the thickness of the existing stripper
tray. Therefore, for safe and efficient operation of the phenol production line, the design of the stripper should
be modified by increasing the thickness of the existing stripper tray. A detailed simulation analysis of the
process is discussed.11251
Keywords: failure analysis, fracture, defects, deformation, strength
1. INTRODUCTION
An azeotropic phenol stripper column is typically used for
the removal of net residue by-products, such as azeotropes,
in the phenol production process. This separate residue strip-
per column section allows the final stripping of phenol from
the residue under a higher vacuum. This in turn allows both
the crude phenol column and the residue stripper column to
be reboiled with medium-pressure steam. Strippers in a phe-
nol production line are generally designed for a high service
life duty cycle and should withstand twice the maximum
operation pressure [1-6]. The block flow diagram (Fig. 1)
shows the major processing steps required to manufacture

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phenol using the Sunoco/UOP Phenol process as an example
[7,8].
This study elaborates the depressive failure at the con-
necting locations between the shell of the azeotropic phe-
nol stripper and the stripper tray in the phenol recovery
process and the effluent wastewater. Cracking failure of an
AISI 304 tray in an azeotropic phenol stripper results in an
emergency shutdown of the plant [2]. Possible causes for
the failure of the stripper tray were analyzed using a FEManalysis with an ANSYS program and solutions for pre-
venting further stripper tray cracking failures are sug-
gested. In this experiment, variables such as the operation
pressure and thickness of the stripper tray were evaluated
in terms of the safe operation of the phenol production
reactor. This work also applies finite element-based struc-
tural optimization methods to redesign the phenol stripper
tray. The goal is to obtain an optimum design that will sup-
port the operation pressures.
2. BACKGROUND
A depressive fracture occurred due to the stress concentra-
tion in the azeotropic phenol stripper tray. The azeotropic
phenol stripper consists of eighteen trays, and the failure at
the connecting locations between the shell of the stripper and
the stripper tray occurred in the bottom tray. This affected
the phenol productivity in a petrochemical plant. The strip-
per tray was manufactured using AISI 304 steel. The
mechanical properties of the AISI 304 steel are shown in
Table 1. Figure 2 shows a schematic design of the azeo-
tropic phenol stripper. The thickness of the bottom strip-
per tray, w, is 52 mm. The bottom stripper tray is circular-
shaped and pided into four parts. The typical operating
pressure is 53.3 kg/cm2
G.3. FAILURE SIMULATION
The commercial analysis code ANSYS is used for this 苯酚汽提塔英文文献和中文翻译:http://www.lwfree.cn/fanyi/20170709/10584.html
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